Re: Native vlan and allowed vlan

Hi Julio,

This depends on your IOS version and platform you are using.
Anyways you can accomplish that VLAN 1 is not allowed on the trunk on
specific platforms.
But as the rest stated you may get messages that the native VLAN is
not the same ... bla bla bla
You can disable these messages by disabeling CDP under the interface.

-- 
Regards,
Iwan Hoogendoorn
CCIE3 #13084 (R&S / Security / SP)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
On Tue, Sep 1, 2009 at 10:02 AM, Julio Carrasco<julio.carrasco_at_ya.com> wrote:
> Hi guys,
>
> Just one small question.
>
> If I leave the default native vlan (vlan 1), configured on a trunk, and I
> issue the "switchport trunk allowed vlan 21,43",
> Does the traffic for vlan 1 still crossing the trunk?, or is blocked by the
> swithport trunk allowed vlan?
>
> Thanks in advance.
> Best regards.
>
>
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-- 
Regards,
Iwan Hoogendoorn
CCIE #13084 (R&S / Security / SP)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net